Malwarebytes intermittently reports blocking an exploit when starting JOSM

[harg]

What steps will reproduce the problem?

1. Launch JOSM on a system with malwarebytes premium installed

What is the expected result?

JOSM starts

What happens instead?

On about 50% of starts, Malwarebytes reports blocking an exploit. Detailed log contains this:

Malwarebytes
www.malwarebytes.com

-Log Details-
Protection Event Date: 14/09/2020
Protection Event Time: 20:44
Log File: a9311d80-f6c2-11ea-8599-107b4445a65b.json

-Software Information-
Version: 4.2.0.82
Components Version: 1.0.1036
Update Package Version: 1.0.29825
Licence: Premium

-System Information-
OS: Windows 10 (Build 18362.1016)
CPU: x64
File System: NTFS
User: System

-Exploit Details-
File: 0
(No malicious items detected)

Exploit: 1
Malware.Exploit.Agent.Generic, C:\Users\<myUserName>\powershell -Command [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12;[System.Net.WebRequest]::Create('https:\grca.nat.gov.tw').GetResponse(), Blocked, 0, 392684, 0.0.0, ,

-Exploit Data-
Affected Application: Java
Protection Layer: Application Behavior Protection
Protection Technique: Exploit payload process blocked
File Name: C:\Users\pcs3\powershell -Command [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12;[System.Net.WebRequest]::Create('https:\grca.nat.gov.tw').GetResponse()
URL:

(end)

Please provide any additional information below. Attach a screenshot if possible.

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2020-09-06 16:54:59 +0200 (Sun, 06 Sep 2020)
Build-Date:2020-09-07 01:30:48
Revision:17013
Relative:URL: ^/trunk

Identification: JOSM/1.5 (17013 en_GB) Windows 10 64-Bit
OS Build number: Windows 10 Pro 1909 (18363)
Memory Usage: 825 MB / 1820 MB (202 MB allocated, but free)
Java version: 1.8.0_202-b08, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Look and Feel: com.sun.java.swing.plaf.windows.WindowsLookAndFeel
Screen: \Display0 1920x1080 (scaling 1.0x1.0)
Maximum Screen Size: 1920x1080
Best cursor sizes: 16x16 -> 32x32, 32x32 -> 32x32

Plugins:
+ AddrInterpolation (35405)
+ DirectDownload (35248)
+ apache-commons (35524)
+ apache-http (35092)
+ buildings_tools (35500)
+ imagery_offset_db (35405)
+ javafx-windows (35458)
+ jna (35092)
+ notesolver (0.3.2)
+ terracer (35499)
+ turnrestrictions (35515)
+ utilsplugin2 (35487)

Tagging presets:
+ https://josm.openstreetmap.de/josmfile?page=Presets/Addr2&zip=1

Map paint styles:
- https://josm.openstreetmap.de/josmfile?page=Styles/Fixme&zip=1
+ <josm.pref>\custom\bigFixmeNodes.mapcss
- <josm.pref>\custom\redHouseNumbers.mapcss

Last errors/warnings:
- 00025.328 E: Failed to locate image 'error_small.png'
- 00025.329 W: Mappaint style "standard" (BigFixmeNodes) icon "error_small.png" not found.

[stoecker]

Report to malwarebyte not us. Yes, we call powershell in the source.